Yucatán carnivorans shed light on the great American biotic interchange

Blaine W. Schubert, James C. Chatters, Joaquin Arroyo-Cabrales, Joshua X. Samuels, Leopoldo H. Soibelzon, Francisco J. Prevosti, Christopher Widga, Alberto Nava, Dominique Rissolo, Pilar Luna Erreguerena

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13 Scopus citations


The Great American Biotic Interchange is considered to be a punctuated process, primarily occurring during four major pulses that began approximately 2.5 Ma. Central America and southeastern Mexico have a poor fossil record of this dynamic faunal history due to tropical climates. Exploration of submerged caves in the Yucatán, particularly the natural trap Hoyo Negro, is exposing a rich and remarkably well-preserved late Pleistocene fauna. Radiometric dates on megafauna range from approximately 38 400-12 850 cal BP, and extinct species include the ursid Arctotherium wingei and canid Protocyon troglodytes. Both genera were previously thought to be indigenous to and confined to South America and appear to represent an instance of large placental mammals, descended from North American progenitors, migrating back north across the Panama Isthmus. This discovery expands the distribution of these carnivorans greater than 2000 km outside South America. Their presence along with a diverse sloth assemblage suggests a more complex history of these organisms in Middle America. We suggest that landscape and ecological changes caused by latest Pleistocene glaciation supported an interchange pulse that included A. wingei, P. troglodytes and Homo sapiens.

Original languageEnglish (US)
Article number148
JournalBiology Letters
Issue number5
StatePublished - May 1 2019

All Science Journal Classification (ASJC) codes

  • Agricultural and Biological Sciences (miscellaneous)
  • General Agricultural and Biological Sciences

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